30078721 has 2 divisors, whose sum is σ = 30078722. Its totient is φ = 30078720.

The previous prime is 30078689. The next prime is 30078749. The reversal of 30078721 is 12787003.

It is a happy number.

It is an a-pointer prime, because the next prime (30078749) can be obtained adding 30078721 to its sum of digits (28).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19678096 + 10400625 = 4436^2 + 3225^2 .

It is a cyclic number.

It is not a de Polignac number, because 30078721 - 2⁵ = 30078689 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 30078721.

It is not a weakly prime, because it can be changed into another prime (30078791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15039360 + 15039361.

It is an arithmetic number, because the mean of its divisors is an integer number (15039361).

Almost surely, 2^30078721 is an apocalyptic number.

It is an amenable number.

30078721 is a deficient number, since it is larger than the sum of its proper divisors (1).

30078721 is an equidigital number, since it uses as much as digits as its factorization.

30078721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2352, while the sum is 28.

The square root of 30078721 is about 5484.4070782538. The cubic root of 30078721 is about 310.9947959414.

The spelling of 30078721 in words is "thirty million, seventy-eight thousand, seven hundred twenty-one".